摘要
岩石属于准脆性材料,在单轴压缩的条件下的应力先是随着应变的增加而增加,当应力达到最大值时,应力开始下降,试件呈现应变软化行为。为研究岩石试件单轴压缩时应力-应变软化段的影响因素,基于位移法得到岩石试件单轴压缩时应力-应变曲线软化段的斜率的解析式,并利用FLAC2D软件针对不同剪切带与主应力的方向的夹角α和不同高宽比的岩石试件进行单轴加载数值模拟结果分析并对解析式进行结果验证。
The rock is quasi - brittle material. Under the condition of uniaxial compression, stress increases with the increase of axial strain firstly, when the stress reaches the maximum value, the stress begins to decline, specimen presents strain softening behavior. To research the ettect tactors of stress - strain softening segment in single axis c, ompression of rock specimen, the slope analytic expression of stress - strain cmwe softening segment during single axis compression of rock specimen are got based on displacement method, and FLAC^2D software are used to analyze uniaxial loading simulation results including angle α formed by different shear zone and principle stress direction and rock specimen with different aspect ratio, and the analytic expression is verified by the result.
出处
《煤矿安全》
CAS
北大核心
2013年第3期29-32,共4页
Safety in Coal Mines
基金
国家自然科学基金资助项目(51174005/51074005/51134012)
教育部"新世纪优秀人才支持计划"资助项目(NCET-08-0819)
安徽高校省级自然科学研究重点资助项目(KJ2011A085)
霍英东青年教师基金基础性研究课题资助项目(121050)
安徽省学术和技术带头人及后备人选学术科研活动资助经费教育部科学技术研究重点项目(210096)
中国矿业大学煤炭资源与安全开采国家重点实验室开放研究基金资助项目(10KF03)
淮南市科技计划资助项目(2009A05014)
关键词
单轴压缩
应变软化
剪切带
数值模拟
uniaxial compression
strain softening
shear zone
numerical simulation
